Libertarians cannot be honest, that is why they can speak openly and frankly.
But your point is correct when you say.
“”If they were honest they would understand that the dispute is not between legislation or no legislation, but between which values ought to be legislated.””
The problem that I have with many who call themselves Libertarians is that they don’t support freedom of religious thought. They demand a political correctness on homosexuality that denies the freedom to support the religious tenets. They demand approval of homosexual activity rather than just tolerance. That is not very Libertarian.
I have also heard Libertarians say that no money should go to parochial schools because they teach religion, including money from vouchers.